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| 0 | No symptoms at all |
| 1 | No significant disability despite symptoms; able to carry out all usual duties and activities. |
| 2 | Slight disability; unable to carry out all previous activities but able to look after own affairs without assistance. |
| 3 | Moderate disability requiring some help, but able to walk without assistance |
| 4 | Moderate severe disability; unable to walk without assistance and unable to attend to won bodily needs without assistance. |
| 5 | Severe disability; bedridden, incontinent, and requiring constant nursing care and attention. |
